CN102230882B - Air testing platform adopting Herroitt multiple-reflection specimen chamber - Google Patents
Air testing platform adopting Herroitt multiple-reflection specimen chamber Download PDFInfo
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- CN102230882B CN102230882B CN 201110091139 CN201110091139A CN102230882B CN 102230882 B CN102230882 B CN 102230882B CN 201110091139 CN201110091139 CN 201110091139 CN 201110091139 A CN201110091139 A CN 201110091139A CN 102230882 B CN102230882 B CN 102230882B
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Abstract
The invention relates to an air concentration testing device, and in particular relates to an air testing platform adopting a Herroitt multiple-reflection specimen chamber. The air testing platform comprises a specimen chamber housing, an infrared light emitter, a light receiver and a conjugated infrared light reflective device. An air inlet and an air outlet are configured on the specimen chamber housing, and an entry direction shifting device and an exit direction shifting device are configured in the cavity of the specimen chamber housing. The conjugated infrared light reflective device comprises two conjugated concave infrared light reflectors fixed on the two ends of specimen chamber housing respectively. The light from the infrared light emitter enters into the cavity of the specimen chamber housing; after being reflected by the entry direction shifting device, the light is reflected many times between the two conjugated concave infrared light reflectors; and the light reflected many times is reflected by the exit direction shifting direction device to the light receiver eventually. The actual optical distance (about 1m) achieved in the invention is over six times as long as the entire length of the body of a multiple-reflection reflecting pool, thus a lower limit of NO testing implemented by the air testing platform with a multiple-reflection reflecting pool can be less than 25 ppm.
Description
Technical field
The present invention relates to a kind of pick-up unit of gas concentration.
Background technology
Non-spectral type infrared gas detection instrument NDIR(non-dispersive infrared analyzer) have simple in structure, movement-less part, life-span is long, dependable performance, the less characteristics of such environmental effects such as simultaneous temperature pressure, and at a plurality of occasions automobile emission gas analyzer for example, the reliable and stable real-time measurements in field such as the continuous flue gas inspection of CEMS become possibility.
Existing NDIR detection platform, generally include the electrical modulation infrared light supply, gold-plated pipe sample cell, pyroelectric sensor with narrow band pass filter, signal is processed, and adopts gold-plated pipe as sample cell, but the NOx measurement will reach the accuracy of detection requirement that is lower than 25ppm, just need the light path more than the long 70cm, if adopt single gold-plated pipe no matter on the installation of product or the thermal stability of physical construction, all can't meet the demands.
Summary of the invention
In order to solve existing NDIR nitrogen oxygen detection platform light path and the conflicting problem of volume, the invention provides the gas detection platform of a kind of Herroitt of employing Multi reflection sample chamber, this detection platform is a kind of long light path, small size, the low-loss gas detection platform of light path.
In order to realize above-mentioned purpose, the present invention has adopted following technical scheme:
A kind of gas detection platform that adopts Herroitt Multi reflection sample chamber, this detection platform comprises sample chamber housing, infrared light emission device, optical pickup apparatus and conjugation infrared reflective device, infrared light emission device and optical pickup apparatus are separately positioned on the housing of sample chamber, the infrared light emission device is the initiating terminal of emission of light, optical pickup apparatus is the end of emission of light, and above the sidewall of sample chamber housing emission of light initiating terminal one side, being provided with air intake, the sidewall below of the opposite side of sample chamber housing is provided with air out; Be provided with incident deviator and outgoing deviator in the housing inner chamber of sample chamber, described conjugation infrared reflective device adopts the conjugation concave surface ir reflector of Herroitt Cell principle to consist of by two, two conjugation concave surface ir reflectors are separately fixed at the two ends of sample chamber housing, the emission of light of infrared light emission device is injected into sample chamber housing inner chamber, light passes through Multi reflection after passing through the reflection of incident deviator between two conjugation concave surface ir reflectors, reflexed on the described optical pickup apparatus by the outgoing deviator at last.
As further improvement, also be provided with attemperating unit and pressure sensor device on the housing of described sample chamber.
As further improvement, described infrared light emission device is made of infrared LED light source and infrared collimation lens, and the middle part above the housing of sample chamber is provided with the first through hole, the infrared LED light source is fixedly installed on the outside of the first through hole, described infrared collimation lens is arranged in the first through hole, and described incident deviator is arranged on the below of the first through hole.
As further improvement, the Infrared Plane catoptron that described incident deviator is adjustable fixed angle.
As further improvement, described optical pickup apparatus is comprised of pyroelectric sensor and the infrared condenser lens with narrow band pass filter, and the left side above the housing of sample chamber is provided with the second through hole, pyroelectric sensor is fixedly installed on the outside of the second through hole, described infrared condenser lens is arranged in the second through hole, and described outgoing deviator is arranged on the below of the second through hole.
As further improvement, described outgoing deviator is for being the Infrared Plane catoptron of adjustable fixed angle.
The present invention is more than six times (about 1m) of Multi reflection tank main body overall length owing to having adopted above-mentioned technical scheme, the actual light path of system, makes the NO measurement lower limit of multiple reflecting pool gas detection platform be less than 25ppm.The present invention is applicable to the flue gas on-line analysis system, the application scenarios such as automobile emission gas analyzer system.
Compared with prior art, the present invention has following characteristics:
1) precision is high, owing to adopted Herroitt Multi reflection formula structure that the detection light path of NO has been brought up to one meter nearly, has improved greatly measuring accuracy and measurement lower limit;
2) life-span long owing to adopted the electrical modulation infrared light supply, the therefore easily worn part chopper that detects without traditional infrared of whole platform, so the mission life of product can reach more than 10 years theoretically;
3) cost is low, utilizes the high reflectance characteristic of Multi reflection formula structure, and not only the loss with luminous energy reduces to minimum, but also has reduced the infrastructure cost of system.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is sectional view of the present invention.
Fig. 3 is Herriott reflection tank schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is made a detailed explanation.
A kind of gas detection platform that adopts Herroitt Multi reflection sample chamber as shown in Figure 1 and Figure 2, this detection platform comprises sample chamber housing 1, infrared light emission device 2, optical pickup apparatus 3 and conjugation infrared reflective device 14.The right sidewall top of sample chamber housing 1 is provided with air intake 8, and the sidewall below, left side of sample chamber housing 1 is provided with air out 9, also is provided with attemperating unit 4 and pressure sensor device 5 on the sample chamber housing 1.As shown in Figure 2, described infrared light emission device 2 is made of infrared LED light source 10 and infrared collimation lens 11, and the middle part above sample chamber housing 1 is provided with the first through hole, infrared LED light source 10 is fixedly installed on the outside of the first through hole, and described infrared collimation lens 11 is arranged in the first through hole.As shown in Figure 2, described optical pickup apparatus 3 is comprised of pyroelectric sensor 12 and the infrared condenser lens 13 with narrow band pass filter, and the left side above sample chamber housing 1 is provided with the second through hole, pyroelectric sensor 12 is fixedly installed on the outside of the second through hole, and described infrared condenser lens 13 is arranged in the second through hole.
As shown in Figure 2, be provided with incident deviator 6 and outgoing deviator in sample chamber housing 1 inner chamber, incident deviator 6 and outgoing deviator 7 are the Infrared Plane catoptron of adjustable fixed angle, incident deviator 6 is arranged on the below of the first through hole, and outgoing deviator 7 is arranged on the below of the second through hole.Conjugation infrared reflective device 14 adopts the conjugation concave surface ir reflector of Herroitt Cell principle to consist of by two, and two conjugation concave surface ir reflectors are separately fixed at the two ends of sample chamber housing 1.
As shown in Figure 3, the infrared light that infrared LED light source 10 sends, behind infrared collimation lens 11 collimations, enter sample chamber housing 1 inner chamber, again by incident deviator 6, adjust optical path direction, make it according to light path shown in the Herroitt reflection tank schematic diagram, form five secondary reflections, because the Herroitt reflection tank is comprised of the spherical reflector of one group of mutual conjugation, with the light of incident by converge-disperse-Multi reflection such as converge, energy loss is very little, finally by crossing outgoing deviator 7, again adjust optical path direction, leave sample chamber housing 1 inner chamber, and assemble through the infrared condenser lens 13 of outgoing, receive infrared light by pyroelectric sensor 12 at last.
Claims (6)
1. gas detection platform that adopts Herroitt Multi reflection sample chamber, it is characterized in that: this detection platform comprises sample chamber housing (1), infrared light emission device (2), optical pickup apparatus (3) and conjugation infrared reflective device (14), infrared light emission device (2) and optical pickup apparatus (3) are separately positioned on the sample chamber housing (1), infrared light emission device (2) is the initiating terminal of emission of light, optical pickup apparatus (3) is the end of emission of light, and above the sidewall of sample chamber housing (1) emission of light initiating terminal one side, being provided with air intake (8), the sidewall below of the opposite side of sample chamber housing (1) is provided with air out (9); Be provided with incident deviator (6) and outgoing deviator (7) in sample chamber housing (1) inner chamber, described conjugation infrared reflective device (14) adopts the conjugation concave surface ir reflector of Herroitt Cell principle to consist of by two, two conjugation concave surface ir reflectors are separately fixed at the two ends of sample chamber housing (1), the emission of light of infrared light emission device (2) is injected into sample chamber housing (1) inner chamber, light passes through Multi reflection after passing through incident deviator (6) reflection between two conjugation concave surface ir reflectors, reflexed on the described optical pickup apparatus (3) by outgoing deviator (7) at last.
2. a kind of gas detection platform that adopts Herroitt Multi reflection sample chamber according to claim 1 is characterized in that: also be provided with attemperating unit (4) and pressure sensor device (5) on the sample chamber housing (1).
3. a kind of gas detection platform that adopts Herroitt Multi reflection sample chamber according to claim 1, it is characterized in that: infrared light emission device (2) is made of infrared LED light source (10) and infrared collimation lens (11), and the middle part above sample chamber housing (1) is provided with the first through hole, infrared LED light source (10) is fixedly installed on the outside of the first through hole, described infrared collimation lens (11) is arranged in the first through hole, and described incident deviator (6) is arranged on the below of the first through hole.
4. according to claim 1 or 3 described a kind of gas detection platforms that adopt Herroitt Multi reflection sample chamber, it is characterized in that: incident deviator (6) is the Infrared Plane catoptron of adjustable fixed angle.
5. a kind of gas detection platform that adopts Herroitt Multi reflection sample chamber according to claim 1, it is characterized in that: optical pickup apparatus (3) is comprised of pyroelectric sensor (12) and the infrared condenser lens (13) with narrow band pass filter, and the left side above sample chamber housing (1) is provided with the second through hole, pyroelectric sensor (12) is fixedly installed on the outside of the second through hole, described infrared condenser lens (13) is arranged in the second through hole, and described outgoing deviator (7) is arranged on the below of the second through hole.
6. a kind of gas detection platform that adopts Herroitt Multi reflection sample chamber according to claim 1 or 5, it is characterized in that: outgoing deviator (7) is the Infrared Plane catoptron of adjustable fixed angle.
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| CN102230882B true CN102230882B (en) | 2013-03-13 |
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| CN103575687B (en) * | 2013-09-29 | 2016-02-10 | 中国科学院安徽光学精密机械研究所 | Portable CO 2highly sensitive detection system |
| CN104502278B (en) * | 2014-12-11 | 2017-11-07 | 北京航天易联科技发展有限公司 | A kind of fiber gas sensor air chamber |
| CN108982398A (en) * | 2018-07-02 | 2018-12-11 | 中船重工安谱（湖北）仪器有限公司 | A kind of long light path trace toxic and harmful gas detection device |
| CA3105472A1 (en) * | 2018-07-03 | 2020-01-09 | Global Analyzer Systems Limited | Self-aligned high finesse optical sensor cell |
| CN110763657B (en) * | 2019-11-20 | 2022-05-13 | 江苏赛诺格兰医疗科技有限公司 | Photoelectric digital conversion system for reflective material reflectivity test system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592601A (en) * | 2008-05-28 | 2009-12-02 | 北京市加华博来科技有限公司 | High-efficiency infrared gas sensor with small volume |
| KR101014245B1 (en) * | 2008-11-11 | 2011-02-16 | 한국표준과학연구원 | Measuring apparatus and method of multi gas pollutants using the NDIR detector with multi gas filter |
| CN202018419U (en) * | 2011-04-12 | 2011-10-26 | 朱坚磊 | Gas detection platform adopting Herroitt multiple reflection sample room |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592601A (en) * | 2008-05-28 | 2009-12-02 | 北京市加华博来科技有限公司 | High-efficiency infrared gas sensor with small volume |
| KR101014245B1 (en) * | 2008-11-11 | 2011-02-16 | 한국표준과학연구원 | Measuring apparatus and method of multi gas pollutants using the NDIR detector with multi gas filter |
| CN202018419U (en) * | 2011-04-12 | 2011-10-26 | 朱坚磊 | Gas detection platform adopting Herroitt multiple reflection sample room |
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